[conformal/btcutil] 8f049a: Correct example links in hdkeychain READEME.md.

[Dave Collins]

  Branch: refs/heads/master
  Home:   https://github.com/conformal/btcutil
  Commit: 8f049a120c264fe9cd0ee9a8e5bbb3a387c097d7
      
https://github.com/conformal/btcutil/commit/8f049a120c264fe9cd0ee9a8e5bbb3a387c097d7
  Author: Dave Collins <da...@conformal.com>
  Date:   2014-07-22 (Tue, 22 Jul 2014)

  Changed paths:
    M hdkeychain/README.md

  Log Message:
  -----------
  Correct example links in hdkeychain READEME.md.